Updated openstack/openstack
Project: openstack/oslo.concurrency  4e7595b3b11c8ea0a62f4b713e209f2a4b7c8cef

Flesh out the README

Add details to the README on what can be done with the library

Closes-Bug: #1391550
Change-Id: Ia5d34d4d23eaab663764aad0d877999a5414e8d0